Aptus Massboost, 5 L

Prevent Calcium and Magnesium Gaps at the Moments That Matter Most

Calcium and magnesium are often treated as background nutrients — something addressed only when visible deficiencies appear. In reality, the demand for both spikes at specific points during flowering, and meeting that demand on time determines whether flowers and stems develop with the structural density you're working toward.

Massboost is a calcium-magnesium bloom additive formulated around that timing. Applied during weeks 3, 5, and 7 of flower — the precise points when Ca and Mg demand peaks — it delivers these elements at the moments that matter most rather than spreading them thinly across the entire cycle.

It can also be used during the vegetative phase if calcium or magnesium deficiencies appear, and it pairs directly with Aptus Liquid Base, which contains no added calcium of its own.

Key Features & Benefits

• Week-specific Ca-Mg delivery — targets weeks 3, 5, and 7 of flower — the periods of peak structural demand — rather than applying across the full cycle.
• Calcium for cell-wall strength and tissue formation — supports the structural integrity of flowers, stems, and new tissue throughout intensive periods of growth.
• Magnesium as the core of chlorophyll — ensures photosynthesis continues at full capacity as the plant redirects energy into flower production.
• Vegetative-phase use if needed — can be applied at 2.5–5 ml per 5 gallons during veg to address early Ca or Mg deficiencies before they compound.
• Designed to pair with Aptus Liquid Base — which contains no added calcium, making Massboost or Mineral-CalMag a required companion in the Aptus system.
• Sized from 1 to 20 liters — lets growers match the bottle to the scale of their operation, from single rooms to commercial facilities.

Who Should Use Aptus Massboost

Growers feeding through the flowering phase who need to prevent Ca and Mg deficiencies at weeks 3, 5, and 7 without disrupting the rest of their feed program — and anyone running Aptus Liquid Base, which requires a dedicated Ca source — with the 5 L size matched to garden scale.

Using Massboost With Aptus Liquid Base

Aptus Liquid Base contains no added calcium by design, which means Massboost or Mineral-CalMag must be part of any feeding program built around it. Apply Massboost at 5–10 ml per 5 gallons during flowering weeks 3, 5, and 7, and at 2.5–5 ml per 5 gallons during veg if deficiency signs appear.

Frequently Asked Questions

Why apply Massboost during specific weeks rather than continuously?

Plant demand for calcium and magnesium spikes at specific developmental stages in flower. Targeting those weeks delivers Ca and Mg when they're needed most rather than diluting the application across the full cycle.

Can Massboost be used during the vegetative stage?

Yes — at 2.5–5 ml per 5 gallons if calcium or magnesium deficiency signs appear during veg. The full bloom-stage dosage of 5–10 ml per 5 gallons applies during weeks 3, 5, and 7 of flower.

How does Massboost pair with Aptus Liquid Base?

Liquid Base contains no added calcium, so Massboost (or Mineral-CalMag) is required to supply Ca and Mg when building a feeding program around BASE.

What separates Massboost from a standard Ca-Mg supplement?

Massboost is formulated for targeted, week-specific application during flowering rather than continuous background dosing — matching the actual demand pattern of the plant through the bloom cycle.